Correct, and neither of these units are the power amp'd version used in the JETI transmitter module. The power amp version never received FCC certification.

Meshnetics visited us years before Atmel ever purchased their intellectual property, trying to steal our business away from Maxstream (Digi). Their power amp'd module was not FCC approved, so the only way we could have switched to it is if we paid for the certification. That made no sense to us for a product the same price as the XBEE modules which did have FCC certification.

Correct, and neither of these units are the power amp'd version used in the JETI transmitter module. The power amp version never received FCC certification.

Meshnetics visited us years before Atmel ever purchased their intellectual property, trying to steal our business away from Maxstream (Digi). Their power amp'd module was not FCC approved, so the only way we could have switched to it is if we paid for the certification. That made no sense to us for a product the same price as the XBEE modules which did have FCC certification.

Those Meshenetic are the original modules they have 124 dB Link Budget which only happen with a RF power amp, AT86RF230 normal Link Budget is (104 dB), Programmable Output Power from -17 dBm up to 3 dBm and Receiver Sensitivity -101 dBm

I chatted with a buddy the other day, who knows some guys flying for Graupner. During their testing, they made a range shoot-out, with the TXes located at the well known Teck slope. They reportedly managed 8km (5 miles) range with the HoTT system, a distance, at which no other system worked.

I chatted with a buddy the other day, who knows some guys flying for Graupner. During their testing, they made a range shoot-out, with the TXes located at the well known Teck slope. They reportedly managed 8km (4 miles) range with the HoTT system, a distance, at which no other system worked.

I chatted with a buddy the other day, who knows some guys flying for Graupner. During their testing, they made a range shoot-out, with the TXes located at the well known Teck slope. They reportedly managed 8km (5 miles) range with the HoTT system, a distance, at which no other system worked.

Which "other Systems" didn't work at that range? There are some different systems out on the market, you know? I don't believe, that they have tested it and compared with all the other available brands under real and fair test-conditions, that is only marketing BS.

I believe, that the range of the new Graupner HoTT-system is very good, outstanding maybe, but "better" than everything else in the world? Come on .....

6km (4 miles) is around 116db free space loss (at good weather and no obstacles).
With help of antenna gain twice of 2db (at each antenna),
and starting at 20dbm Tx power,
received signal should be around 20+2-116+2 = -92dbm.
- well, that should be well within specs of most "better" receivers on market..
Everything should depend on area noise. And of course, also signal reflections (multipath attenuation).

However, that isthe ideal case. In worst case (one antenna pointing toward tx and second perpendictual antenna in cross polarisation position), great attenuation should occur, and I would be curious about results - e.g. if plane would get slowly turned into all possible directions.
Because it do not matter how far it could work in best case, all what matters in RC is the distance at which it will work always, rock solid - regardless of plane position.

6km (4 miles) is around 116db free space loss (at good weather and no obstacles).
With help of antenna gain twice of 2db (at each antenna),
and starting at 20dbm Tx power,
received signal should be around 20+2-116+2 = -92dbm.
- well, that should be well within specs of most "better" receivers on market..
Everything should depend on area noise. And of course, also signal reflections (multipath attenuation).

However, that isthe ideal case. In worst case (one antenna pointing toward tx and second perpendictual antenna in cross polarisation position), great attenuation should occur, and I would be curious about results - e.g. if plane would get slowly turned into all possible directions.
Because it do not matter how far it could work in best case, all what matters in RC is the distance at which it will work always, rock solid - regardless of plane position.

You have to add the Fade Margin to the calculation to get
more real results.

Have you got any tech specs of the HoTT RF modules ? rx sensitivity,
tx output power (I believe 20dBm to get as long as possible operating
range) ? And any info regarding RF protocol used ? Like the frame
length, bps used, frame rate, hoping period ?

I chatted with a buddy the other day, who knows some guys flying for Graupner. During their testing, they made a range shoot-out, with the TXes located at the well known Teck slope. They reportedly managed 8km (5 miles) range with the HoTT system, a distance, at which no other system worked.

I chatted with a buddy the other day, who knows some guys flying for Graupner, a company being under § 11.

During their testing, they made a range shoot-out, with the TXes located at the well known Teck slope. They reportedly managed 8km range with the HoTT system, a distance at which the Jeti system, with which they compared HoTT, didn't work.

The experts were surpised and in follow up asked themselves : " Did we send with more than the allowable 100 mW EIRP, because of this incredible range advantage? "